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Here, a sterically engineered ion\u2010pair confinement strategy in Cu(I) halide soft\u2010salt microcrystals was reported to achieve conjugation\u2013disruption and high\u2010efficient through\u2010space charge transfer (TSCT) between Cu\n                    <jats:sub>2<\/jats:sub>\n                    I\n                    <jats:sub>3<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    anionic clusters and ligands coordinated to Cu\n                    <jats:sup>+<\/jats:sup>\n                    centers. Strong electrostatic confinement and conformational locking suppress ligand \u03c0\u2010conjugation and metal\u2013ligand orbital coupling, thereby localizing electronic delocalization, and stabilizing high\u2010energy blue emission. Substituent engineering (methyl or fluorine) modulates steric environments and supramolecular packing, enhancing lattice rigidity and suppressing dynamic disorder by inhibiting solvent inclusion during crystal growth and promoting radiative recombination. Notably,\n                    <jats:bold>\n                      Cu\n                      <jats:sub>2<\/jats:sub>\n                      I\n                      <jats:sub>3<\/jats:sub>\n                      P(o\u2010tol)\n                      <jats:sub>3<\/jats:sub>\n                      (6\u2010Me\u2010dppy)\n                    <\/jats:bold>\n                    exhibits negative thermal quenching (NTQ) behavior due to thermally activated population transfer within a confined excited\u2010state manifold. This synergistic integration of conjugation blocking, ionic confinement, and steric regulation effectively suppresses non\u2010radiative decay, yielding a light yield of 3.67 times that of BGO and excellent environmental and radiation stability. The resulting flexible microcrystal\u2010based scintillator films further enable high\u2010resolution (&gt;20 lp mm\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) x\u2010ray imaging, while maintaining stable performance in underwater environments. Furthermore, the films support multi\u2010angle imaging acquisition and high\u2010fidelity three\u2010dimensional computed tomography reconstruction. This work establishes a general design paradigm for advanced blue\u2010emitting scintillators in next\u2010generation x\u2010ray imaging.\n                  <\/jats:p>","DOI":"10.1002\/adma.74809","type":"journal-article","created":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T10:11:18Z","timestamp":1787825478000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Ion\u2010Pair Confinement Enables Through\u2010Space Charge Transfer for Negative Thermal Quenching Blue\u2010Emitting Scintillators in High\u2010Resolution X\u2010Ray Imaging"],"prefix":"10.1002","volume":"38","author":[{"given":"Qunbo","family":"Mei","sequence":"first","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junjie","family":"Ye","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nianshu","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Le","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts &amp; Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-4687-6063","authenticated-orcid":false,"given":"Qian","family":"Cao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; 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